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spec: clarify evaluation order

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Fixes #3852.

R=r, rsc, iant, ken
CC=golang-dev
https://golang.org/cl/6441102
This commit is contained in:
Robert Griesemer 2012-08-09 11:50:16 -07:00
parent 20bf1a94e1
commit f05a91e18b
1 changed files with 11 additions and 3 deletions
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14
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{ <!--{
"Title": "The Go Programming Language Specification", "Title": "The Go Programming Language Specification",
"Subtitle": "Version of July 11, 2012", "Subtitle": "Version of August 9, 2012",
"Path": "/ref/spec" "Path": "/ref/spec"
}--> }-->
@ -3694,8 +3694,10 @@ overflow etc. errors being caught.
<h3 id="Order_of_evaluation">Order of evaluation</h3> <h3 id="Order_of_evaluation">Order of evaluation</h3>
<p> <p>
When evaluating the elements of an assignment or expression, When evaluating the <a href="#Operands">operands</a> of an expression,
all function calls, method calls and <a href="#Assignments">assignment</a>, or
<a href="#Return_statements">return statement</a>,
all function calls, method calls, and
communication operations are evaluated in lexical left-to-right communication operations are evaluated in lexical left-to-right
order. order.
</p> </p>
@ -3715,6 +3717,12 @@ and indexing of <code>x</code> and the evaluation
of <code>y</code> is not specified. of <code>y</code> is not specified.
</p> </p>
<pre>
a := 1
f := func() int { a = 2; return 3 }
x := []int{a, f()} // x may be [1, 3] or [2, 3]: evaluation order between a and f() is not specified
</pre>
<p> <p>
Floating-point operations within a single expression are evaluated according to Floating-point operations within a single expression are evaluated according to
the associativity of the operators. Explicit parentheses affect the evaluation the associativity of the operators. Explicit parentheses affect the evaluation